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Organization and Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) - USD ($) | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accounting Policies [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  |  |  |  |  | $ (7,759,472) | $ (6,316,021) | $ (18,207,163)
Cumulative dividends on Series G Preferred Stock |  |  |  |  |  |  |  |  | 0 | 0 | 0
Numerator, basic and diluted net loss available to stockholders |  |  |  |  |  |  |  |  | $ (7,759,472) | $ (6,316,021) | $ (18,207,163)
Shares used in computation - basic: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 8,209,539 | 7,564,082 | 7,413,602
Shares used in computation - diluted: |  |  |  |  |  |  |  |  |  |  |
Weighted average common shares outstanding |  |  |  |  |  |  |  |  | 8,209,539 | 7,564,082 | 7,413,602
Net loss per share - basic and diluted | $ (0.17) | $ (0.27) | $ (0.23) | $ (0.28) | $ (0.32) | $ (0.28) | $ (0.25) | $ 0.01 | $ (0.95) | $ (0.84) | $ (2.46)

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